android贝塞尔曲线饼图,iOS:使用贝塞尔曲线绘制图表（折线图、柱状图、饼状图）...
1.介绍：
UIBezierPath ：画贝塞尔曲线的path类
UIBezierPath定义 ： 贝赛尔曲线的每一个顶点都有两个控制点，用于控制在该顶点两侧的曲线的弧度。
曲线的定义有四个点：起始点、终止点(也称锚点)以及两个相互分离的中间点。
滑动两个中间点，贝塞尔曲线的形状会发生变化。
UIBezierPath ：对象是CGPathRef数据类型的封装，可以方便的让我们画出 矩形 、 椭圆 或者 直线和曲线的组合形状
初始化方法：
+ (instancetype)bezierPath;
//创建一个矩形
+ (instancetype)bezierPathWithRect:(CGRect)rect;
//创建圆形或者椭圆形
+ (instancetype)bezierPathWithOvalInRect:(CGRect)rect;
+ (instancetype)bezierPathWithRoundedRect:(CGRect)rect cornerRadius:(CGFloat)cornerRadius; // rounds all corners with the same horizontal and vertical radius
+ (instancetype)bezierPathWithRoundedRect:(CGRect)rect byRoundingCorners:(UIRectCorner)corners cornerRadii:(CGSize)cornerRadii;
+ (instancetype)bezierPathWithArcCenter:(CGPoint)center radius:(CGFloat)radius startAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle clockwise:(BOOL)clockwise;
+ (instancetype)bezierPathWithCGPath:(CGPathRef)CGPath;
2.最基本的使用方法是：
//设置描绘的起点
- (void)moveToPoint:(CGPoint)point;
//画直线
- (void)addLineToPoint:(CGPoint)point;
//画曲线
(1)绘制二次贝塞尔曲线 分别对应终点和一个控制点
- (void)addQuadCurveToPoint:(CGPoint)endPoint controlPoint:(CGPoint)controlPoint
(1)绘制三次贝塞尔曲线 分别对应终点和两个控制点
- (void)addCurveToPoint:(CGPoint)endPoint controlPoint1:(CGPoint)controlPoint1 controlPoint2:(CGPoint)controlPoint2;
//画圆弧
- (void)addArcWithCenter:(CGPoint)center radius:(CGFloat)radius startAngle:(CGFloat)startAngle endAngle:(CGFloat)endAngle clockwise:(BOOL)clockwise
3.使用贝塞尔曲线的基本步骤是：
(1)创建一个Bezier path对象。
(2)使用方法moveToPoint:去设置初始线段的起点。
(3)添加line或者curve去定义一个或者多个subpaths。
(4)改变UIBezierPath对象跟绘图相关的属性。
4.demo演示如下：
创建一个工具类，BezierCurveView，同时给它创建一个xib文件，它继承自UIView，用来专门绘制图表的画布
BezierCurveView.h
//
// BezierCurveView.h
// BezierCurveLineDemo
//
// Created by mac on 16/7/20.
// Copyright © 2016年 xiayuanquan. All rights reserved.
//
#import
#define MARGIN 30 // 坐标轴与画布间距
#define Y_EVERY_MARGIN 20 // y轴每一个值的间隔数
// 颜色RGB
#define XYQColor(r, g, b) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:1.0]
#define XYQColorRGBA(r, g, b, a) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:a]
// 随机色
#define XYQRandomColor XYQColor(arc4random_uniform(256), arc4random_uniform(256), arc4random_uniform(256))
// 线条类型
typedef NS_ENUM(NSInteger, LineType) {
LineType_Straight, // 折线
LineType_Curve // 曲线
};
@interface BezierCurveView : UIView
//初始化画布
+(instancetype)initWithFrame:(CGRect)frame;
/**
* 画折线图
* @param x_names x轴值的所有值名称
* @param targetValues 所有目标值
* @param lineType 直线类型
*/
-(void)drawLineChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues LineType:(LineType) lineType;
/**
* 画柱状图
* @param x_names x轴值的所有值名称
* @param targetValues 所有目标值
*/
-(void)drawBarChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues;
/**
* 画饼状图
* @param x_names x轴值的所有值名称
* @param targetValues 所有目标值
*/
-(void)drawPieChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues;
@end
BezierCurveView.m
//
// BezierCurveView.m
// BezierCurveLineDemo
//
// Created by mac on 16/7/20.
// Copyright © 2016年 xiayuanquan. All rights reserved.
//
#import "BezierCurveView.h"
static CGRect myFrame;
@interface BezierCurveView ()
@end
@implementation BezierCurveView
//初始化画布
+(instancetype)initWithFrame:(CGRect)frame{
BezierCurveView *bezierCurveView = [[NSBundle mainBundle] loadNibNamed:@"BezierCurveView" owner:self options:nil].lastObject;
bezierCurveView.frame = frame;
//背景视图
UIView *backView = [[UIView alloc] initWithFrame:CGRectMake(, , frame.size.width, frame.size.height)];
backView.backgroundColor = XYQColor(, , );
[bezierCurveView addSubview:backView];
myFrame = frame;
return bezierCurveView;
}
/**
* 画坐标轴
*/
-(void)drawXYLine:(NSMutableArray *)x_names{
UIBezierPath *path = [UIBezierPath bezierPath];
//1.Y轴、X轴的直线
[path moveToPoint:CGPointMake(MARGIN, CGRectGetHeight(myFrame)-MARGIN)];
[path addLineToPoint:CGPointMake(MARGIN, MARGIN)];
[path moveToPoint:CGPointMake(MARGIN, CGRectGetHeight(myFrame)-MARGIN)];
[path addLineToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-*MARGIN, CGRectGetHeight(myFrame)-MARGIN)];
//2.添加箭头
[path moveToPoint:CGPointMake(MARGIN, MARGIN)];
[path addLineToPoint:CGPointMake(MARGIN-, MARGIN+)];
[path moveToPoint:CGPointMake(MARGIN, MARGIN)];
[path addLineToPoint:CGPointMake(MARGIN+, MARGIN+)];
[path moveToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-*MARGIN, CGRectGetHeight(myFrame)-MARGIN)];
[path addLineToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-*MARGIN-, CGRectGetHeight(myFrame)-MARGIN-)];
[path moveToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-*MARGIN, CGRectGetHeight(myFrame)-MARGIN)];
[path addLineToPoint:CGPointMake(MARGIN+CGRectGetWidth(myFrame)-*MARGIN-, CGRectGetHeight(myFrame)-MARGIN+)];
//3.添加索引格
//X轴
for (int i=; i
CGFloat X = MARGIN + MARGIN*(i+);
CGPoint point = CGPointMake(X,CGRectGetHeight(myFrame)-MARGIN);
[path moveToPoint:point];
[path addLineToPoint:CGPointMake(point.x, point.y-)];
}
//Y轴(实际长度为200,此处比例缩小一倍使用)
for (int i=; i
CGFloat Y = CGRectGetHeight(myFrame)-MARGIN-Y_EVERY_MARGIN*i;
CGPoint point = CGPointMake(MARGIN,Y);
[path moveToPoint:point];
[path addLineToPoint:CGPointMake(point.x+, point.y)];
}
//4.添加索引格文字
//X轴
for (int i=; i
CGFloat X = MARGIN + + MARGIN*i;
UILabel *textLabel = [[UILabel alloc] initWithFrame:CGRectMake(X, CGRectGetHeight(myFrame)-MARGIN, MARGIN, )];
textLabel.text = x_names[i];
textLabel.font = [UIFont systemFontOfSize:];
textLabel.textAlignment = NSTextAlignmentCenter;
textLabel.textColor = [UIColor blueColor];
[self addSubview:textLabel];
}
//Y轴
for (int i=; i
CGFloat Y = CGRectGetHeight(myFrame)-MARGIN-Y_EVERY_MARGIN*i;
UILabel *textLabel = [[UILabel alloc] initWithFrame:CGRectMake(, Y-, MARGIN, )];
textLabel.text = [NSString stringWithFormat:@"%d",*i];
textLabel.font = [UIFont systemFontOfSize:];
textLabel.textAlignment = NSTextAlignmentCenter;
textLabel.textColor = [UIColor redColor];
[self addSubview:textLabel];
}
//5.渲染路径
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = path.CGPath;
shapeLayer.strokeColor = [UIColor blackColor].CGColor;
shapeLayer.fillColor = [UIColor clearColor].CGColor;
shapeLayer.borderWidth = 2.0;
[self.subviews[].layer addSublayer:shapeLayer];
}
/**
* 画折线图
*/
-(void)drawLineChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues LineType:(LineType) lineType{
//1.画坐标轴
[self drawXYLine:x_names];
//2.获取目标值点坐标
NSMutableArray *allPoints = [NSMutableArray array];
for (int i=; i
CGFloat doubleValue = *[targetValues[i] floatValue]; //目标值放大两倍
CGFloat X = MARGIN + MARGIN*(i+);
CGFloat Y = CGRectGetHeight(myFrame)-MARGIN-doubleValue;
CGPoint point = CGPointMake(X,Y);
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(point.x-, point.y-, 2.5, 2.5) cornerRadius:2.5];
CAShapeLayer *layer = [CAShapeLayer layer];
layer.strokeColor = [UIColor purpleColor].CGColor;
layer.fillColor = [UIColor purpleColor].CGColor;
layer.path = path.CGPath;
[self.subviews[].layer addSublayer:layer];
[allPoints addObject:[NSValue valueWithCGPoint:point]];
}
//3.坐标连线
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:[allPoints[] CGPointValue]];
CGPoint PrePonit;
switch (lineType) {
case LineType_Straight: //直线
for (int i =; i
CGPoint point = [allPoints[i] CGPointValue];
[path addLineToPoint:point];
}
break;
case LineType_Curve: //曲线
for (int i =; i
if (i==) {
PrePonit = [allPoints[] CGPointValue];
}else{
CGPoint NowPoint = [allPoints[i] CGPointValue];
[path addCurveToPoint:NowPoint controlPoint1:CGPointMake((PrePonit.x+NowPoint.x)/, PrePonit.y) controlPoint2:CGPointMake((PrePonit.x+NowPoint.x)/, NowPoint.y)]; //三次曲线
PrePonit = NowPoint;
}
}
break;
}
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = path.CGPath;
shapeLayer.strokeColor = [UIColor greenColor].CGColor;
shapeLayer.fillColor = [UIColor clearColor].CGColor;
shapeLayer.borderWidth = 2.0;
[self.subviews[].layer addSublayer:shapeLayer];
//4.添加目标值文字
for (int i =; i
UILabel *label = [[UILabel alloc] init];
label.textColor = [UIColor purpleColor];
label.textAlignment = NSTextAlignmentCenter;
label.font = [UIFont systemFontOfSize:];
[self.subviews[] addSubview:label];
if (i==) {
CGPoint NowPoint = [allPoints[] CGPointValue];
label.text = [NSString stringWithFormat:@"%.0lf",(CGRectGetHeight(myFrame)-NowPoint.y-MARGIN)/];
label.frame = CGRectMake(NowPoint.x-MARGIN/, NowPoint.y-, MARGIN, );
PrePonit = NowPoint;
}else{
CGPoint NowPoint = [allPoints[i] CGPointValue];
if (NowPoint.y
label.frame = CGRectMake(NowPoint.x-MARGIN/, NowPoint.y-, MARGIN, );
}else{ //文字置于点下方
label.frame = CGRectMake(NowPoint.x-MARGIN/, NowPoint.y, MARGIN, );
}
label.text = [NSString stringWithFormat:@"%.0lf",(CGRectGetHeight(myFrame)-NowPoint.y-MARGIN)/];
PrePonit = NowPoint;
}
}
}
/**
* 画柱状图
*/
-(void)drawBarChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues{
//1.画坐标轴
[self drawXYLine:x_names];
//2.每一个目标值点坐标
for (int i=; i
CGFloat doubleValue = *[targetValues[i] floatValue]; //目标值放大两倍
CGFloat X = MARGIN + MARGIN*(i+)+;
CGFloat Y = CGRectGetHeight(myFrame)-MARGIN-doubleValue;
UIBezierPath *path = [UIBezierPath bezierPathWithRect:CGRectMake(X-MARGIN/, Y, MARGIN-, doubleValue)];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = path.CGPath;
shapeLayer.strokeColor = [UIColor clearColor].CGColor;
shapeLayer.fillColor = XYQRandomColor.CGColor;
shapeLayer.borderWidth = 2.0;
[self.subviews[].layer addSublayer:shapeLayer];
//3.添加文字
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(X-MARGIN/, Y-, MARGIN-, )];
label.text = [NSString stringWithFormat:@"%.0lf",(CGRectGetHeight(myFrame)-Y-MARGIN)/];
label.textColor = [UIColor purpleColor];
label.textAlignment = NSTextAlignmentCenter;
label.font = [UIFont systemFontOfSize:];
[self.subviews[] addSubview:label];
}
}
/**
* 画饼状图
*/
-(void)drawPieChartViewWithX_Value_Names:(NSMutableArray *)x_names TargetValues:(NSMutableArray *)targetValues{
//设置圆点
CGPoint point = CGPointMake(self.frame.size.width/,self.frame.size.height/);
CGFloat startAngle = ;
CGFloat endAngle ;
CGFloat radius = ;
//计算总数
__block CGFloat allValue = ;
[targetValues enumerateObjectsUsingBlock:^(NSNumber *targetNumber, NSUInteger idx, BOOL * _Nonnull stop) {
allValue += [targetNumber floatValue];
}];
//画图
for (int i =; i
CGFloat targetValue = [targetValues[i] floatValue];
endAngle = startAngle + targetValue/allValue**M_PI;
//bezierPath形成闭合的扇形路径
UIBezierPath *bezierPath = [UIBezierPath bezierPathWithArcCenter:point
radius:radius
startAngle:startAngle endAngle:endAngle
clockwise:YES];
[bezierPath addLineToPoint:point];
[bezierPath closePath];
//添加文字
CGFloat X = point.x + *cos(startAngle+(endAngle-startAngle)/) - ;
CGFloat Y = point.y + *sin(startAngle+(endAngle-startAngle)/) - ;
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(X, Y, , )];
label.text = x_names[i];
label.font = [UIFont systemFontOfSize:];
label.textColor = XYQColor(, , );
[self.subviews[] addSubview:label];
//渲染
CAShapeLayer *shapeLayer=[CAShapeLayer layer];
shapeLayer.lineWidth = ;
shapeLayer.fillColor = XYQRandomColor.CGColor;
shapeLayer.path = bezierPath.CGPath;
[self.layer addSublayer:shapeLayer];
startAngle = endAngle;
}
}
@end
在ViewController.m文件中测试如下：
//
// ViewController.m
// BezierCurveLineDemo
//
// Created by mac on 16/7/22.
// Copyright © 2016年 xiayuanquan. All rights reserved.
//
#import "ViewController.h"
#import "BezierCurveView.h"
#define SCREEN_W [UIScreen mainScreen].bounds.size.width
#define SCREEN_H [UIScreen mainScreen].bounds.size.height
@interface ViewController ()
@property (strong,nonatomic)BezierCurveView *bezierView;
@property (strong,nonatomic)NSMutableArray *x_names;
@property (strong,nonatomic)NSMutableArray *targets;
@end
@implementation ViewController
/**
* X轴值
*/
-(NSMutableArray *)x_names{
if (!_x_names) {
_x_names = [NSMutableArray arrayWithArray:@[@"语文",@"数学",@"英语",@"物理",@"化学",@"生物",@"政治",@"历史",@"地理"]];
}
return _x_names;
}
/**
* Y轴值
*/
-(NSMutableArray *)targets{
if (!_targets) {
_targets = [NSMutableArray arrayWithArray:@[@,@,@,@,@,@,@,@,@]];
}
return _targets;
}
- (void)viewDidLoad {
[super viewDidLoad];
//1.初始化
_bezierView = [BezierCurveView initWithFrame:CGRectMake(, , SCREEN_W-, )];
_bezierView.center = self.view.center;
[self.view addSubview:_bezierView];
//2.折线图
[self drawLineChart];
//3.柱状图
// [self drawBaseChart];
//4.饼状图
// [self drawPieChart];
}
//画折线图
-(void)drawLineChart{
//直线
// [_bezierView drawLineChartViewWithX_Value_Names:self.x_names TargetValues:self.targets LineType:LineType_Straight];
//曲线
[_bezierView drawLineChartViewWithX_Value_Names:self.x_names TargetValues:self.targets LineType:LineType_Curve];
}
//画柱状图
-(void)drawBaseChart{
[_bezierView drawBarChartViewWithX_Value_Names:self.x_names TargetValues:self.targets];
}
//画饼状图
-(void)drawPieChart{
[_bezierView drawPieChartViewWithX_Value_Names:self.x_names TargetValues:self.targets];
}
@end
演示截图如下：
下载地址：
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